| http://www.w3.org/ns/prov#value | - In a further embodiment of the process in accordance with the invention a retinoid carboxylic acid Ret-OH can be reacted with a reactive derivative of an alcohol HA. As examples of reactive derivatives there come into consideration e.g. tosylates and mesylates or halides, i.e. compounds in which one hydroxy group is replaced by a tosyloxy or mesyloxy group or by halogen, especially iodine.
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